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I recently acquired a Walz Envoy 35. After a couple of test rolls, I am satisfied that the rangefinder is off just a skosh. I've also used a tape measurer to confirm. It's not far off, but enough to keep images from being sharp. I'm wondering if anybody can help me understand how to remove the top. I think I know which screw needs to be turned to adjust the rangefinder if I can get the top off.

Alternatively, does anybody know a repairperson who is familiar with these cameras?